Sigma 28-45mm F1.8 DG DN Art review: the world’s first constant-aperture f/1.8 zoom lens for full-frame cameras

The Sigma 28-45mm F1.8 DG DN Art is geared to Sony and L-mount shooters who feel the need for a speedy aperture rating, at the expense of a limited zoom range

5 Star Rating
Sigma 28-45mm F1.8 DG DN Art
(Image: © Matthew Richards)

Digital Camera World Verdict

I like the way that the Sigma 28-45mm F1.8 DG DN Art combines the convenience of a zoom lens with the fast and constant f/1.8 aperture rating of two or three fixed focal length prime lenses. The trade-off is that the actual zoom range is limited, and that it’s pretty bulky and weighty, but no more so than some 24-70mm f/2.8 ‘trinity’ standard zooms.


  • +

    Fast and constant f/1.8 aperture

  • +

    Excellent image quality and handling

  • +

    Replaces 2 or 3 prime lenses


  • -

    Limited overall zoom range

  • -

    A bit big and weighty

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Sigma offers a diverse range of lenses in its ‘Global Vision’ Art, Sports, and Contemporary line-ups, aiming to offer ideal solutions to all sorts of photographers who are into every conceivable genre of photography. As an ‘Art’ lens, the 28-45mm F1.8 puts creative expression and excellence of image quality front and center of its design ethos. 

Indeed, Sigma claims it delivers comparable sharpness and clarity to that of a prime lens, throughout its entire zoom range. The outright zoom range might seem fairly limited but it covers popular prime focal lengths of 28mm, 35mm, and (very nearly) 50mm.

Swipe to scroll horizontally
Mount optionsSony E, L-mount
Lens construction18 elements in 15 groups
Angle of view75.4-51.3 degrees
Diaphragm blades11
Minimum aperturef/16
Minimum focus distance0.3m
Maximum magnification0.25x
Filter size82mm
Swipe to scroll horizontally
FeaturesWide-angle to standard perspectives come with a constant f/1.8 aperture rating.★★★★★
DesignFrom fast autofocus to exotic handling finery, the design is top-notch.★★★★★
PerformanceIt lives up to its claims of prime lens quality from a versatile zoom lens.★★★★★
ValueConsidering that it performs the same task as three prime lenses, it’s great value.★★★★★
Sigma 24-70mm F2.8 DG DN II Art

The Sigma 24-70mm F2.8 DG DN II Art was launched at about the same time as this 28-45mm lens. Naturally, it has a rather slower constant aperture of f/2.8 but gives a more generous zoom range and is noticeably lighter in weight.

Canon RF 28-70mm F2L USM

The Canon RF 28-70mm F2L USM is only a third of an f/stop slower than the Sigma but has a more generous zoom range, stretching to a short telephoto focal length. That makes it rather better for portraiture and it’s an ideal lens for wedding and event photographers, but it’s nearly 50 per cent heavier and getting on for three times more expensive to buy.

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Matthew Richards

Matthew Richards is a photographer and journalist who has spent years using and reviewing all manner of photo gear. He is Digital Camera World's principal lens reviewer – and has tested more primes and zooms than most people have had hot dinners! 

His expertise with equipment doesn’t end there, though. He is also an encyclopedia  when it comes to all manner of cameras, camera holsters and bags, flashguns, tripods and heads, printers, papers and inks, and just about anything imaging-related. 

In an earlier life he was a broadcast engineer at the BBC, as well as a former editor of PC Guide.